One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10,14,13)(11,15,19,17)(12,20,22,16)(18,24,21,23)(25,26)(27,32)(28,29)(30,33)(31,34)(35,39)(36,37)(38,40)(3,7)(6,8)(9,10,14,13)(11,17,19,15)(12,20,22,16)(18,23,21,24)(25,27,31,28)(26,29,34,32)(30,35,38,36)(33,37,40,39)(1,2)(3,6)(4,5)(7,8)(10,13)(15,17)(16,20)(23,24)(25,27,31,28)(26,32,34,29)(30,36,38,35)(33,37,40,39)(1,3)(2,6)(4,7)(5,8)(9,11)(10,15)(12,21)(13,17)(14,19)(16,24)(18,22)(20,23)(25,28,31,27)(26,32,34,29)(30,36,38,35)(33,39,40,37)(1,2)(3,6)(4,5)(7,8)(9,12)(10,16)(11,18)(13,20)(14,22)(15,23)(17,24)(19,21)(25,29,31,32)(26,28,34,27)(30,37,38,39)(33,36,40,35)(9,13,14,10)(11,17,19,15)(12,20,22,16)(18,24,21,23)(25,30,31,38)(26,33,34,40)(27,35,28,36)(29,37,32,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.